It probably already has Google's "find my device" app (on old devices it would be called "Android Device Manager"), so just make sure that is activated. You can easily test it with a Web browser (just type "find my device" into your search engine and you'll find the site).
Several security apps have device location functions. I don't have one installed currently, but I know Avast used to, and I believe Cerberus did as well.
Obviously these things can only work if the phone is powered up and connected to the Internet.